Security readout for executives and security teams
Plain-English summary
CVE-2023-6520 affects the WP 2FA WordPress plugin through version 2.5.0. A missing or bypassable nonce check lets an outside attacker abuse a forged request to send arbitrary-content emails to registered users, if they trick a logged-in administrator or user into taking an action such as clicking a link.
Executive priority
Treat as a routine but time-bounded WordPress plugin update. The business risk is mainly trust erosion and targeted phishing-style abuse through site-generated email, not system compromise. Prioritize internet-facing WordPress sites and administrator awareness until patched.
Technical view
The vulnerable send_backup_codes_email function performs nonce validation only when a nonce is present. Omitting the nonce can bypass the check, creating a CSRF issue. The CVSS 3.1 score is 4.3, with network attack vector, low complexity, no privileges, required user interaction, and low integrity impact.
Likely exposure
Exposure is limited to WordPress sites running WP 2FA - Two-factor authentication for WordPress version 2.5.0 or older. Sites without this plugin, or running a vendor-confirmed fixed version, are not indicated as affected by the provided sources.
Exploitation context
The source bundle does not show CISA KEV listing or other evidence of active exploitation. Abuse requires social engineering a logged-in administrator or registered user into triggering a forged request. The documented impact is unauthorized email sending to registered users, not account takeover or code execution.
Researcher notes
The key implementation detail is conditional nonce enforcement: validation occurs only if a nonce is set. The provided references identify the vulnerable function and a WordPress Trac changeset, but the bundle does not explicitly name a fixed release version or prove exploitation in the wild.
Mitigation direction
- Identify all WordPress sites using the WP 2FA plugin.
- Upgrade WP 2FA from version 2.5.0 or older according to vendor guidance.
- Review vendor changelog or WordPress Trac changeset for the nonce validation fix.
- Warn administrators against clicking unexpected WP 2FA-related links while remediation is pending.
Validation and detection
- Confirm installed WP 2FA versions across production and staging WordPress sites.
- Verify send_backup_codes_email rejects requests without a valid nonce.
- Review mail logs for unexpected backup-code emails or unusual registered-user email bursts.
- Check whether the site is running a vendor-confirmed release newer than the affected range.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-352: User-session and phishing behavior lookup
Client-side and session-facing weaknesses should be reviewed alongside initial-access and user-execution behaviors. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCVE-2023-6520 mapping review
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Open ATT&CK lookup- Severity
- Medium
- CVSS
- 4.3 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N2.81.4Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
4.3MediumVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N
Source materials
- CVE List V5 sourceCVE List V5
- https://www.wordfence.com/threat-intel/vulnerabilities/id/0af451be-2477-453c-a230-7f3fb804398b?source=cveCVE reference
- https://plugins.trac.wordpress.org/browser/wp-2fa/trunk/includes/classes/Admin/class-setup-wizard.php?rev=2940688#L606CVE reference
- https://plugins.trac.wordpress.org/changeset?sfp_email=&sfph_mail=&reponame=&old=3009922%40wp-2fa&new=3009922%40wp-2fa&sfp_email=&sfph_mail=CVE reference
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Cross-Site Request Forgery (CSRF)
Cross-Site Request Forgery (CSRF) represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.